/Engine/Plugins/Runtime/nDisplay/Source/DisplayCluster/Public/DisplayClusterRootActor.h
Return inner frustum priority by InnerFrustum name (from InnerFrustumPriority property) return -1, if not defined
int GetInnerFrustumPriority ( const [FString](API\Runtime\Core\Containers\FString) & InnerFrustumID ) const